refactor: rename materia → beanflows throughout codebase

- Rename src/materia/ → src/beanflows/ (Python package)
- Rename transform/sqlmesh_materia/ → transform/sqlmesh_beanflows/
- Rename infra/supervisor/materia-supervisor.service → beanflows-supervisor.service
- Rename infra/backup/materia-backup.{service,timer} → beanflows-backup.{service,timer}
- Update all path strings: /opt/materia → /opt/beanflows, /data/materia → /data/beanflows
- Update pyproject.toml: project name, CLI entrypoint, workspace source key
- Update all internal imports from materia.* → beanflows.*
- Update infra scripts: REPO_DIR, service names, systemctl references
- Fix docker-compose.prod.yml: /data/materia → /data/beanflows (bind mount path)

Intentionally left unchanged: Pulumi stack name (materia-infrastructure) and
Hetzner resource names ("materia-key", "managed_by: materia") — these reference
live cloud infrastructure and require separate cloud-side renames.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

transform/sqlmesh_beanflows/config.yaml

@@ -0,0 +1,41 @@
+# --- Gateway Connection ---
+# Single local DuckDB gateway
+# Local dev uses virtual environments (e.g., dev_<username>)
+# Production uses the 'prod' environment
+gateways:
+  duckdb:
+    connection:
+      type: duckdb
+      catalogs:
+        local: '{{ env_var("DUCKDB_PATH", "local.duckdb") }}'
+
+default_gateway: duckdb
+
+# --- Variables ---
+variables:
+  LANDING_DIR: '{{ env_var("LANDING_DIR", "data/landing") }}'
+
+# --- Model Defaults ---
+# https://sqlmesh.readthedocs.io/en/stable/reference/model_configuration/#model-defaults
+
+model_defaults:
+  dialect: duckdb
+  start: 2025-07-07 # Start date for backfill history
+  cron: '@daily'    # Run models daily at 12am UTC (can override per model)
+
+# --- Linting Rules ---
+# https://sqlmesh.readthedocs.io/en/stable/guides/linter/
+
+linter:
+  enabled: true
+  rules:
+    # ambiguousorinvalidcolumn removed: sqlglot cannot introspect read_csv() TVF
+    # schemas at lint time, causing false positives on all raw models. Cross-model
+    # column validation is handled by SQLMesh at plan time via columns() declarations.
+    - invalidselectstarexpansion
+
+# --- Default Target Environment ---
+# Prevents accidentally applying plans to prod during local development.
+# https://sqlmesh.readthedocs.io/en/stable/guides/configuration/#default-target-environment
+
+default_target_environment: dev_{{ user() }}